Attachment of motor-vehicle road springs



Sept. 18, 1928. 1,685,005

D. ROBERTSON ATTACHMENT OF MOTOR VEHICLE ROAD SPRINGS Original Filed 6, 1926 I I IIIl lNV ENTOR DOUGLAS IQOBERTSO ATTORNEY Patented Sept. 18, 1928.

UNITED STATES DOUGLAS ROBERTSON, 0F NURIOOTPA, SOUTH AUSTRALIA, AUSTRALIA.

ATTACHMENT OF MOTOR-VEHICLE ROAD SPRINGS.

Original application filed January 6, 1926,'Serial No. 79,621. Divided and this application filed May 6,

1927. Serial No. 189,340.

. The application is a divisional applicationof that of my application Serial Number 79,621 filed January 6, 1926.

This invention comprises certain improvements in the attachment of motor vehicle road springs. It is applicable to those springs which are hingedly attached either direct to the vehicle frame member or to the axle, or to a bracket secured to the frame member or to the axle, as well as to springs which are attached by means of a shackle.

According to this inventionthe bearing of the hinge bolt within the eye is formed by spiral threads forming a series of opposed inclined bearing surfaces formed upon the opposed faces of two concentric bushes, the one bush encircling and being fitted securely to the bolt and the other bush fitting within and being held by the eye, the said spiral threads forming a plurality of annular grooves and ridges of somewhat flattened .V shape in cross section whereby sidewise movement of the spring leaf relatively to the frame member, shackle plates or other part is prevented and rattle is eliminated.

In order that my invention may be more clearly understood I will describe the same with reference to the accompanying drawings which are given by way of illustration or example, and in which Fig. 1 is a side view showing the usual arrangement of a semi-elliptic spring relatively to a vehicle frame, the one end of the spring being hingedly attached direct to the frame member and the other end be ing attached thereto by means of a shackle and a bracket.

Fig. 2 is a central section as upon line 2, 2 of Fig. 1 showing my invention applied to the attachment of the one end of a spring to the end of a vehicle frame member or to a bracket upon same.

In the drawings 10 represents the frame member or bracket to which the spring is hingedly attached. 11 represents the eye of the spring, and 12 represents the hinge boltwhich passes through and is held immovably in the cheeks of the frame member or bracket 10. Fitting'tightly upon the bolt 12 is a bush 13 the external surface of which is made in the form of a spiral or screw thread to produce the desired inclined bearing surfaces forming a plurality of annular grooves and ridges of somewhat flattened V shape in cross section. The bush 13 fits thereon.

Encircling the bush 13 and fitting tightly within the eye 11 is a bush 14. internally threaded to form the desired inclined bearing surfaces forming a plurality of annular ridges and grooves of somewhat flattened V shape complementary to and fitting neatly to the grooves and ridges of the bush 13, the contacting faces of the grooves and ridges forming the working surfaces of the bearing. After being fitted up the bush 14 does not move within the eye 11. A small clearance is left between the ends of the bush 14 and cheeks of the frame tightly upon the bolt 12 and does not move member 10 which maybe fitted with a felt washer or some soft .substance'which will retain lubricant.

As shown in Fig. l'the one end of the spring is attached to the frame member 10 by means of a bracket 16 and shackle 17, in which case'the eye of the bracket 16 is bushed similarly to the eye of the spring.

The weight of the vehicle holds the en circling bush 14 central upon the encircled bush 13 and prevents sidewise movement, and consequently prevents rattle of the spring against the frame member or bracket.

What I claim is 1. In an attachment for the road spring of a motor vehicle, the combination with a hinge bolt, of a bush encircling the bolt and fitted to said bolt, a second bush cylindrical in shape and adapted to receive the first-mentioned bush, said bushes having spiral threads, the thread of the first-mentioned bush being complementary to that of the second-mentioned bush, and an eye receiving the second-mentioned bush and holding said bush in position on the first-mentioned bush.

2. An attaching means for a spring comprising a hinge bolt, a bush on. the bolt, and a second bush on the first bush, the bushes being adapted to be arranged in the eye of a spring and having on their opposing faces spaced projections, the pro3ections of one bush fitting between the projections of the other bush.

In testimony that I claim the foregoing as my invention I have si ned my name this25th day of March, 192?.

DOUGLAS ROBERTSON. 

